UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

Form 8-K

Current Report

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 29, 2014

INPHI CORPORATION

(Exact name of registrant as specified in its charter)

2953 Bunker Hill Lane, Suite 300, Santa Clara, California 95054

(Address of principal executive offices, with zip code)

(408) 217-7300

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Inphi Corporation (the “Company”) held an Annual Meeting of Stockholders on May 29, 2014. There were 31,295,803 shares of common stock entitled to vote at the Annual Meeting of Stockholders, of which 29,944,420 shares were voted in person or by proxy.

At the Annual Meeting, the Company’s stockholders voted on Proposal 1 and Proposal 3, and the Company adjourned and reconvened the Annual Meeting with respect to Proposal 2. The following is a brief description of each matter and the results of each matter voted upon, including the number of votes cast for or against each matter and the number of abstentions and broker non-votes, if applicable, with respect to each matter. Each Proposal is described in more detail in the Company’s definitive proxy statement filed with the Securities and Exchange Commission on April 25, 2014.

Proposal 1: Election of three Class I directors to hold office until the 2017 Annual Meeting of Stockholders or until their successors are elected and qualified:

Proposal 3: The ratification of the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for 2014:

Proposal to Adjourn: To approve adjournment of the Annual Meeting with respect to Proposal 2 to be reconvened on June 2, 2014 at 10:00 a.m. at the offices of Pillsbury Winthrop Shaw Pittman LLP, located at 2550 Hanover Street, Palo Alto, California 94304.

Proposal 2: To vote, on an advisory basis, on the compensation of the named executive officers of the Company:

The Company adjourned the Annual Meeting to allow for additional time for stockholders to vote on Proposal 2. The Annual Meeting was reconvened on June 2, 2014 at 10:00 a.m., Pacific time. The following are the results of the votes for Proposal 2, including the number of votes cast for or against each matter and the number of abstentions:

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Item 8.01. Other Events.

On May 30, 2014, the Company issued a news release announcing the results of the Annual Meeting and adjournment regarding Proposal 2. The press release, a copy of which is filed as Exhibit 99.1 to this report, is incorporated by reference herein.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

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